ACOS

The
ACOS function returns the
angle, expressed in radians, whose cosine is
X
(i.e., the arc-cosine). The range of ACOS is between 0 and
p
.

Calling Sequence

Result = ACOS(
X
)

Arguments

X

The cosine of the desired angle in the range (-1
<=
X
<=
1). If
X
is double-precision floating, the result of ACOS is also double-precision.
X
cannot be complex. All other types are converted to single-precision floating-point and yield floating-point results. If
X
is an array, the result has the same structure, with each element containing the
arc-cosine of the corresponding element of
X
.

Example

To find the arc-cosine of 0.707 and store the result in the variable B, enter: